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Finding the Fourth Proportional to 19,383.40, 29,031.90 and 16,791.40

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Solution

The fourth proportional to 19,383.40, 29,031.90 and 16,791.40 is: 25,149.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,383.40 : 29,031.90 = 16,791.40 : x
  2. Step 2: Convert to fraction form
    19,383.40/29,031.90 = 16,791.40/x
  3. Step 3: Cross multiply
    19,383.40x = 29,031.90 × 16,791.40
  4. Step 4: Simplify right side
    19,383.40x = 487,486,245.66
  5. Step 5: Solve for x
    x = 487,486,245.66/19,383.40
  6. Step 6: Final answer
    x = 25,149.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.